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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '20262f2f593f87cb13e59fd6cdafbb51571dfab844decab8ce3db4cb0fd3a2f1' 
  AND token = 'mhomImc1hxZJ1SxNcqsAuB7EH0rNZ1Ux8I1kK+jeLOg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}